A capacitor of capacitance $C$ consists of two large parallel metal plates. The coefficient of linear expansion of the metal is $\alpha$. What is the change in capacitance if the temperature of the plates rises by $\Delta T$, while the gap between the plates is kept fixed?

• Correct answer
  A

  $2 \alpha \Delta T C$
• B

  $\alpha \Delta T C$
• C

  $-2 \alpha \Delta T C$
• D

  $-\alpha \Delta T C$

Hence, the correct answer is option: 'A'.